Applying the Concepts

81. $y = 15$ $y = 15$
83. $s = 45$ $s = 45$
85. Maximum height: 1000; the missile hits the ground at $x = 200 .$ $x = 200 .$
87. $x = \approx 24.5 ft, y \approx 16.3 ft$ $x = \approx 24.5 ft, y \approx 16.3 ft$
89.
2. $x = 50$ $x = 50$
91.
1. $P (x) = - \frac{3}{1000} x^{2} + 20.1 x - 150$ $P (x) = - \frac{3}{1000} x^{2} + 20.1 x - 150$
2. 3350
3. $\bar{C} (x) = \frac{3}{1000} x + 3.9 + \frac{150}{x}$ $\bar{C} (x) = \frac{3}{1000} x + 3.9 + \frac{150}{x}$
93. $245
95. $6 \sqrt{2} in$ $6 \sqrt{2} in$
97.
1. 36 amp
2. $150 Ω$ $150 Ω$
99.
1. $k = \frac{1}{200, 000}$ $k = \frac{1}{200, 000}$
2. 500 people every day
3. 10,00 or 19,000

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Table of Contents for Applying the Concepts